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   <title>cosh :: Functions (Quaternion Toolbox Function Reference)
</title><link rel="stylesheet" href="qtfmstyle.css" type="text/css"></head><body><h1>Quaternion Function Reference</h1><h2>cosh</h2>
<p>Hyperbolic cosine<br>(Quaternion overloading of standard MATLAB&reg; function)
</p>
<h2>Syntax</h2><p><tt>Y = cosh(X)</tt></p>
<h2>Description</h2>
<p>
<tt>cosh(X)</tt> computes the hyperbolic cosine of the quaternion argument <tt>X</tt>
which may be a complexified quaternion.
</p>

<h2>Examples</h2>
<pre>
&gt;&gt; cosh(1 + qi)

ans = 0.8337 + 0.9889 * I + 0 * J + 0 * K
</pre>

<h2>See Also</h2>QTFM function: <a href="sinh.html">sinh</a><br>MATLAB&reg; function: <a href="matlab:doc cosh">cosh</a><br>
<h4>&copy; 2008-2010 Stephen J. Sangwine and Nicolas Le Bihan</h4><p><a href="license.html">License terms.</a></p></body></html>